CN103756509B - A kind of anti-electromagnetic radiation anti-contamination function coating and preparation method thereof - Google Patents
A kind of anti-electromagnetic radiation anti-contamination function coating and preparation method thereof Download PDFInfo
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- CN103756509B CN103756509B CN201410010879.8A CN201410010879A CN103756509B CN 103756509 B CN103756509 B CN 103756509B CN 201410010879 A CN201410010879 A CN 201410010879A CN 103756509 B CN103756509 B CN 103756509B
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Abstract
The invention discloses a kind of anti-electromagnetic radiation functional paint and preparation method thereof, coating active principle mass fraction is film-forming resin 15 ~ 30 parts, compounded mix 50 ~ 85 parts, solvent 30 ~ 100 parts, coupling agent 0.5 ~ 15 part.The invention has the beneficial effects as follows that compounded mix plating Ni-Cu-La-B is that reductive agent is formed with sodium borohydride, binding force of cladding material, electroconductibility, wear resistance are good, thus improve the quality of electromagnetic wave screen paint.
Description
Technical field
The invention belongs to electromagnetic shielding material technical field, relate to a kind of anti-electromagnetic radiation anti-contamination function coating and preparation method thereof.
Background technology
Due to developing rapidly of the widespread use of electric power in social production and human lives and electronics and the communication technology, hertzian wave spreads in the space environment that the mankind depend on for existence, defines specific to modern society the electromagnetic radiation pollution being referred to as " stealthy killer ".The electromagnetic interference that electromagnetic radiation pollution causes, electromagnetic information divulge a secret and electromagnetic environmental pollution more and more serious on the live impact that brings of economic construction, national defense safety and social production.Electromagnetic radiation pollution has become the fourth-largest environmental pollution after topsoil, water pollutions and noise pollution, and United Nations's human environment conference has been listed in one of principal pollutant that must control.Control electromagnetic radiation pollution one of important content becoming environment protection.
For preventing various hertzian wave to the harm of device security, information security and mankind itself's safety, in the urgent need to strengthening government to the regulatory constraints in electromagnetic environmental pollution source, strengthen the publicity to electromagnetic radiation pollution protection, education and guiding, study, develop and promote economical and practical electromagnetic radiation Prevention Technique.Shielding, ground connection and filtering suppress three of electromagnetic radiation large gordian techniquies.Shield the technology of with electromagnetic shielding material, electronic electric equipment and residing environment thereof being protected exactly.Ground connection is to prevent electromagnetic interference from will do forever good electrical connection between shielding and the metal shell of ground or interfering source; this both can equipment in available protecting shield earthing body from the interference of external electromagnetic ripple, alleviate by the electromagnetic intensity reduced outside shielding or eliminate the harm of hertzian wave to human body again.Filtering be exactly by wave filter, filtering circuit etc. from the Received signal strength containing noise or interference by the filtering of specific band frequency, thus extract a kind of technological method of useful signal component.Ground connection is supplementary means that is a kind of and the matching used control electromagnetic radiation of shielding, and filtering needs special equipment and technology.Comparatively speaking, because cost performance is higher, easy to use and flexible, electromagnetic wave shielding technology has become a kind of effective means of electromagenetic wave radiation prevention and cure of pollution.
Shielding material is the important substance basis realizing electromagnetic wave shielding technology, shielding material realizes electromagnetic wave shielding technology by such as under type, one is by the engineering plastics case surface of electronic electric equipment by plating, chemical plating metal, forms surface conduction coating and reach shield effectiveness on plastic casing surface; Two is formed surface conduction coating in the engineering plastics case surface of electronic electric equipment by spraying, brushing electromagnetic wave screen paint and reached shield effectiveness; Three is in the engineering plastics process manufacturing electronic electric equipment, add conductive filler material form monolithic conductive plastics; Four are the door and windows in house residing for electronic electric equipment, wall, top ceiling and ground by spraying, brush electromagnetic wave screen paint and form electromagnetic wave shielding house and reach shield effectiveness.Comparatively speaking, plating, electroless plating engineering plastics and add conductive filler material and form that the cost of monolithic conductive plastics is higher, construction is inconvenient; And by spraying, brush that electromagnetic wave screen paint forms that the cost in surface conduction coating or electromagnetic wave shielding house is not high, construction flexibly, convenient.Electromagnetic wave screen paint is adopted to carry out to the spurious electromagnetic waves that interference electronic and electrical equipment normally works a kind of method that electromagnetic wave shielding process is effective control electromagnetic radiation pollution.
For electromagnetic wave screen paint, the cost of conductive filler material and conductivity, proportion etc. have become the key factor of its cost performance of restriction and application thereof.The metal such as the comparatively single employing gold and silver of filler, aluminium, nickel, copper of traditional electromagnetic wave screen paint, though electroconductibility is good, because its high cost, proportion are excessive, significantly limit its marketing and uses.Research and develop and promote economical and practical electromagnetic wave screen paint to have a very important role and meaning to suppressing electromagnetic radiation to improve electromagnetic environment.Electroless plating is a kind of environmental protection, cost is lower, apply surface metalation method of modifying more widely, the coating utilizing electroless plating technology to prepare is even, firm and composition is easy to control, one of electroless plating conventional technology of preparing having become novel electromagnetic shielding compounded mix.At present, with plastics, fabric, fiber, glass microballon, timber, metal or mineral crystal whisker etc. for matrix, successfully prepare various new electromagnetic shielding complex conductive fillers with electroless plating technology preparation.The cost of pure metal powder can be reduced with electroless plating technology in pure metal Surface coating one deck electroconductibility such as gold and silver, copper, nickel, the anti-oxidant and good sheet metal of chemical property to a certain extent, improve the defects such as its chemical property is unstable.But the density of the metals such as gold and silver, copper, nickel, iron is excessive, comparatively large with the density variation of resin, plastic substrate etc., affect homogeneity and the stability of shielding material.In order to make up the excessive easy shortcoming affecting the performance of electromagnetic shielding material of metallic cover type conduction compounded mix proportion, researchist with inorganic non-metallic powders such as the graphite of low density, low cost, cenosphere, calcium magnesium silicate mineral whisker, glass fibre for matrix, with electroless plating technology at the good metallics of its Surface coating electroconductibility, chemical stability and rotproofness, prepare the lightweight conductive compounded mix that cost performance is higher.Glass fibre is crisp, wear resistance and electroconductibility poor, reduce the cost performance of glass fibre to a certain extent, limit its range of application.To glass fibre after the pre-treatment such as oil removing, alligatoring, sensitization, activation, utilize sodium borohydride reduction agent by nickel, copper, the reduction of lanthanum ion chemistry in solution at the fiberglass surfacing in catalytic activity, when not having extrinsic current to pass through, make it to form metal plating, thus obtained surface is containing the electroconductive glass fibre of Ni-Cu-La-B, thus give glass fibre good conductivity.Make compounded mix with metal powder, plating Ni-Cu-La-B glass fibre, make filmogen with macromolecule resin, through the operation such as mixing, grinding, filtration, anti-electromagnetic radiation functional paint can be obtained.
Summary of the invention
The object of the present invention is to provide a kind of anti-electromagnetic radiation functional paint, solve the bonding force of current anti-electromagnetic radiation coating itself, electroconductibility, the imperfect problem of wear resisting property.
Another object of the present invention is to provide a kind of making method of anti-electromagnetic radiation functional paint.
The technical solution adopted in the present invention is coating active principle mass fraction is film-forming resin 15 ~ 30 parts, compounded mix 50 ~ 85 parts, solvent 30 ~ 100 parts, coupling agent 0.5 ~ 15 part.
Feature of the present invention is also that film-forming resin is at least one in silicone resin, Synolac, resol, urethane, epoxy resin, acrylic resin and/or vibrin.Compounded mix is made up of bi-material: metal powder, and metal powder is the one in the copper powder of 20nm ~ 100 μm particle diameter, aluminium powder, silver powder, nickel powder and/or zinc powder; Plating Ni-Cu-La-B glass fibre, plating Ni-Cu-La-B glass fibre length and diameter than 5 ~ 100, length 10 ~ 200 μm, diameter 2 ~ 30 μm, containing Ni15 ~ 50wt%, Cu2 ~ 15wt%, La0.5 ~ 5wt%, B0.5 ~ 5wt%; The ratio of plating Ni-Cu-La-B glass fibre in compounded mix is 1 ~ 15 part.Coupling agent is the one in silane, organosilicon, stearic acid, Aluminate and/or titanic acid ester.Solvent is at least one in butylacetate, methyl acetate, ethyl acetate, methylethylketone, acetone, methyl alcohol, ethanol, toluene and/or dimethylbenzene.
Another kind of technical scheme of the present invention is the surface treatment of step a, compounded mix:
Be that the coupling agent solution of 0.5 ~ 10%, 0.5 ~ 15 part adds in 50 ~ 85 parts of compounded mixs by percent mass, use ball mill grinding at normal temperatures 20 ~ 60 minutes, after filler to be composite mixes with coupling agent solution, in temperature 80 ~ 120 DEG C oven dry, for subsequent use; The preparation of step b, composite coating:
It is the film-forming resin 15 ~ 30 parts of 40 ~ 70% by solid content, solvent 30 ~ 100 parts mixes with the compounded mix processed in a step 50 ~ 85 parts, at normal temperatures with shredder grinding 2 ~ 5 times, filtration, adjusting viscosity to 20 ~ 50 second, obtain the coating of anti-electromagnetic radiation function.
The invention has the beneficial effects as follows that compounded mix plating Ni-Cu-La-B is that reductive agent is formed with sodium borohydride, binding force of cladding material, electroconductibility, wear resistance are good, thus improve the quality of electromagnetic wave screen paint.
Embodiment
The present invention is directed to the deficiencies in the prior art, and a kind of anti-electromagnetic radiation functional paint and preparation method thereof is provided, be characterized in adopting metal powder, plating Ni-Cu-La-B glass fibre makes compounded mix, filmogen is made with macromolecule resin, through the operation such as mixing, grinding, filtration, make anti-electromagnetic radiation functional paint.
Object of the present invention is realized by following technical measures, raw materials used number, except specified otherwise, be mass fraction: the recipe ingredient of anti-electromagnetic radiation functional paint is: film-forming resin 15 ~ 30 parts, compounded mix 50 ~ 85 parts, solvent 30 ~ 100 parts, coupling agent 0.5 ~ 15 part, wherein, film-forming resin is at least one in silicone resin, Synolac, resol, urethane, epoxy resin, acrylic resin and/or vibrin;
Surface-treated compounded mix carries out surface-treated by coupling agent to compounded mix, and this compounded mix counts 50 ~ 85 parts by mass parts, and this coupling agent counts 0.5 ~ 15 part by mass parts;
Compounded mix is bi-material composition:
1, metal powder is the one in the copper powder of 20nm ~ 100 μm particle diameter, aluminium powder, silver powder, nickel powder and/or zinc powder;
2, plating Ni-Cu-La-B glass fibre length and diameter are than 5 ~ 100, length 10 ~ 200 μm, diameter 2 ~ 30 μm, containing Ni15 ~ 50wt%, Cu2 ~ 15wt%, La0.5 ~ 5wt%, B0.5 ~ 5wt%, the ratio of plating Ni-Cu-La-B glass fibre in compounded mix is 1 ~ 15 part;
Coupling agent is the one in silane, organosilicon, stearic acid, Aluminate and/or titanic acid ester;
Solvent is at least one in butylacetate, methyl acetate, ethyl acetate, methylethylketone, acetone, methyl alcohol, ethanol, toluene and/or dimethylbenzene.
The preparation method of anti-electromagnetic radiation functional paint:
The surface treatment of a, compounded mix,
Be that 0.5 ~ 10%, 0.5 ~ 15 part of coupling agent solution adds in 50 ~ 85 parts of compounded mixs by mass percent concentration, use ball mill grinding at normal temperatures 20 ~ 60 minutes, after filler to be composite mixes with coupling agent solution, in temperature 80 ~ 120 DEG C oven dry, for subsequent use.
The preparation of b, composite coating,
It is the film-forming resin 15 ~ 30 parts of 40 ~ 70% by solid content, solid content is that emulsion or coating or film-forming resin dry the mass percent that rear remainder accounts for total amount under prescribed conditions, with the compounded mix 50 ~ 85 parts of above-mentioned process, solvent 30 ~ 100 parts mixing, at normal temperatures with shredder grinding 2 ~ 5 times, filter, adjusting viscosity to 20 ~ 50 second (by the viscosity that painting 4 viscometer is measured 25 DEG C time), obtains anti-electromagnetic radiation functional paint.
Electromagnetic shielding composite coating prepared by aforesaid method, adopts cold spray apparatus spraying or the equipment of brushing to brush, at normal temperatures dry and solidification.The quantitative measurement of anti-electromagnetic radiation functional paint the results are shown in Table 1,
Table 1
The physical performance index of coating has reached the relevant regulations of I national military standard GJB2604-96 " military electromagnetic screen coating general specification ".At frequency 30kHz ~ 1.5GHz, its electromagnetic shielding effectiveness reaches 40 ~ 65dB, it has the performance of anti-electromagnetic wave interference, anti-electronics leakage of information and anti-electromagnetic environmental pollution, can be widely used in the electromagnetic wave shielding of electronics and IT products, builds the aspect such as electromagnetic wave shielding room and ELECTRONIC INFORMATION SECURITY room.
The present invention has following features:
1, the coating provided has good shielding effect in wideband region to hertzian wave, and be within the scope of 30kHz ~ 1.5GHz at wave frequency, its electromagnetic shielding effectiveness can reach 40 ~ 65dB.
2, compared with conventional electromagnetic wave screen paint (as Ni-based electromagnetic wave screen paint etc.), the price of every square metre of electromagnetic wave shielding coating can reduce by 10 ~ 30%.
3, the preparation of coating, construction, drying and solidification are carried out all at normal temperatures, and save energy is easy to use.
4, simple, the easy handling of the preparation method of coating, use conventional equipment completely, investment is little, and risk is less, is convenient to promote.
Below by specific embodiment, invention is described.
Median size is 4 μm of nickel powders 60 parts by embodiment 1., Fibre diameter is 10 μm, Fiber Aspect Ratio is 10,9 parts, plating Ni-Cu-La-B glass fibre containing Ni20wt%, Cu2wt%, La0.5wt%, B0.5wt%, add in the 10 parts of silane ethanolic solns prepared, solution of silane concentration is 8%, with ball mill grinding 30 minutes, after being uniformly dispersed, in temperature 90 DEG C oven dry.By solid content be 60% epoxy resin 20 parts and above-mentioned surface-treated compounded mix 60 parts and ethanol 55 parts mix, at normal temperatures with shredder grinding 2 ~ 5 times, filter, adjusting viscosity to 20 ~ 50 second (by the viscosity that painting 4 viscometer is measured 25 DEG C time), obtain anti-electromagnetic radiation functional paint.
Median size is 1.5 μm of copper powders 55 parts by embodiment 2., 7 parts, the plating Ni-Cu-La-B glass fibre that Fibre diameter is 3 μm, Fiber Aspect Ratio is 60, fiber contains Ni30wt%, Cu3wt%, La0.7wt%, B0.5wt%, add in the 8 parts of stearic acid acetone solns prepared, stearic acid concentration is 7.5%, with ball mill grinding 20 minutes, after being uniformly dispersed, in temperature 80 DEG C oven dry.By solid content be 70% acrylic resin 15 parts and above-mentioned surface-treated compounded mix 55 parts and 50 parts, acetone mix, at normal temperatures with shredder grinding 2 ~ 5 times, filter, adjusting viscosity to 20 ~ 50 second (by the viscosity that painting 4 viscometer is measured 25 DEG C time), obtain anti-electromagnetic radiation functional paint.
Median size is 2 μm of aluminium powders 70 parts by embodiment 3., Fibre diameter is 15 μm, Fiber Aspect Ratio is 10, fiber is containing Ni35wt%, Cu2wt%, La0.5wt%, 10 parts, the plating Ni-Cu-La-B glass fibre of B0.7wt%, add in the 12 parts of titanic acid ester acetone solns prepared, titanic acid ester concentration is 4%, with ball mill grinding 30 minutes, after being uniformly dispersed, in temperature 100 DEG C oven dry, by solid content be 65% 20 parts, resol and above-mentioned surface-treated compounded mix 70 parts and toluene 65 parts mix, at normal temperatures with shredder grinding 2 ~ 5 times, filter, adjusting viscosity to 20 ~ 50 second (by the viscosity that painting 4 viscometer is measured 25 DEG C time), obtain anti-electromagnetic radiation functional paint.
Claims (5)
1. an anti-electromagnetic radiation anti-contamination function coating, is characterized in that: active principle mass fraction is film-forming resin 15 ~ 30 parts, compounded mix 50 ~ 85 parts, solvent 30 ~ 100 parts, coupling agent 0.5 ~ 15 part;
Described compounded mix is made up of bi-material:
Metal powder: metal powder is the one in the copper powder of 20nm ~ 100 μm particle diameter, aluminium powder, silver powder, nickel powder and/or zinc powder;
Plating Ni-Cu-La-B glass fibre: plating Ni-Cu-La-B glass fibre length and diameter than 5 ~ 100, length 10 ~ 200 μm, diameter 2 ~ 30 μm, containing Ni15 ~ 50wt%, Cu2 ~ 15wt%, La0.5 ~ 5wt%, B0.5 ~ 5wt%; The ratio of plating Ni-Cu-La-B glass fibre in compounded mix is 1 ~ 15 part.
2., according to anti-electromagnetic radiation anti-contamination function coating a kind of described in claim 1, it is characterized in that: described film-forming resin is at least one in silicone resin, Synolac, resol, urethane, epoxy resin, acrylic resin and/or vibrin.
3., according to anti-electromagnetic radiation anti-contamination function coating a kind of described in claim 1, it is characterized in that: described coupling agent is the one in silane, organosilicon, stearic acid, Aluminate and/or titanic acid ester.
4., according to anti-electromagnetic radiation anti-contamination function coating a kind of described in claim 1, it is characterized in that: described solvent is at least one in butylacetate, methyl acetate, ethyl acetate, methylethylketone, acetone, methyl alcohol, ethanol, toluene and/or dimethylbenzene.
5., according to a kind of described in claim 1 preparation method of anti-electromagnetic radiation anti-contamination function coating, it is characterized in that:
The surface treatment of step a, compounded mix:
Be that the coupling agent solution of 0.5 ~ 10%, 0.5 ~ 15 part adds in 50 ~ 85 parts of compounded mixs by percent mass, use ball mill grinding at normal temperatures 20 ~ 60 minutes, after filler to be composite mixes with coupling agent solution, in temperature 80 ~ 120 DEG C oven dry, for subsequent use;
The preparation of step b, composite coating:
It is the film-forming resin 15 ~ 30 parts of 40 ~ 70% by solid content, solvent 30 ~ 100 parts mixes with the compounded mix processed in a step 50 ~ 85 parts, at normal temperatures with shredder grinding 2 ~ 5 times, filtration, adjusting viscosity to 20 ~ 50 second, by the viscosity that painting 4 viscometer is measured 25 DEG C time, obtain the coating of anti-electromagnetic radiation function.
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| CN108395807A (en) * | 2018-03-06 | 2018-08-14 | 成都理工大学 | A kind of anti-electromagnetic radiation anti-contamination function coating and preparation method thereof |
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| CN101265386A (en) * | 2008-04-22 | 2008-09-17 | 浙江大学 | Composite type electromagnetic wave shielding paint and method for preparing same |
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